Frequency calibration of wireless telecommunication device

Abstract

A wireless telecommunication device, a method of frequency calibrating a wireless telecommunication device, and a computer program are provided. The method comprises: receiving a reference radio signal of the wireless telecommunications system; frequency synchronizing the wireless telecommunication device with the reference radio signal by adjusting a control parameter controlling a reference frequency generated by a reference frequency generator; measuring a temperature parameter characterizing the temperature of the reference frequency generator; and generating calibration information for calibrating the wireless telecommunication device on the basis of the control parameter and the temperature parameter.

1. A wireless telecommunication device comprising:
 a receiver configured to receive a reference radio signal of a wireless telecommunications system; 
 a reference frequency generator configured to generate a reference frequency for the wireless telecommunication device on the basis of a control parameter wherein the reference frequency generator is configured to generate a first frequency and a second frequency simultaneously, the first frequency having a first response to temperature of the reference frequency generator and the second frequency having a second response to temperature of the reference frequency generator, the second response being different from the first response; 
 a frequency synchronizer, connected to the receiver, configured to determine the control parameter in a calibration procedure by frequency synchronizing the wireless telecommunication device with the reference radio signal; 
 a temperature measurement unit configured to generate a temperature parameter characterizing the temperature of the reference frequency generator by using the first frequency and the second frequency; and 
 a calibration unit, connected to the temperature measurement unit, configured to generate calibration information comprising the control parameter determined by the frequency synchronizer and the temperature parameter associated with the control parameter and to store the calibration information in the calibration procedure, wherein the calibration unit is further configured to apply a control parameter associated with a current temperature parameter to the reference frequency generator after the calibration procedure. 
 
   
   
     2. The wireless telecommunication device of  claim 1 , wherein the calibration unit is further configured to determine a calibration curve on the basis of the control parameter and the temperature parameter and to store the calibration curve. 
   
   
     3. The wireless telecommunication device of  claim 2 , wherein the calibration unit comprises an associative array for storing calibration points of the calibration curve. 
   
   
     4. The wireless telecommunication device of  claim 2 , wherein the calibration unit is configured to determine calibration parameters characterizing the calibration curve and to store the calibration parameters. 
   
   
     5. The wireless telecommunication device of  claim 1 , wherein the calibration unit is configured to generate a temperature-compensated control parameter on the basis of the calibration information as a response to an input of a temperature parameter; and
 wherein the reference frequency generator is configured to adjust the frequency reference on the basis of the temperature-compensated control parameter. 
 
   
   
     6. A device comprising:
 receiving means for receiving a reference radio signal of a wireless telecommunications system; 
 frequency synchronizing means for determining, in a calibration procedure, a control parameter controlling a reference frequency generated by a reference frequency generator by frequency synchronizing the device with the reference radio signal wherein the reference frequency generator is configured to generate a first frequency and a second frequency simultaneously, the first frequency having a first response to temperature of the reference frequency generator and the second frequency having a second response to temperature of the reference frequency generator, the second response being different from the first response; 
 measuring means for generating a temperature parameter characterizing the temperature of the reference frequency generator by using the first frequency and the second frequency; and 
 generating means for generating, in the calibration procedure, calibration information for calibrating the device, the calibration information comprising the determined control parameter and the temperature parameter associated with the control parameter, and for applying a control parameter associated with a current temperature parameter to the reference frequency generator after the calibration procedure. 
 
   
   
     7. A method comprising:
 receiving, in a wireless telecommunication device, a reference radio signal of a wireless telecommunications system; 
 determining, in a calibration procedure, a control parameter controlling a reference frequency generated by a reference frequency generator by frequency synchronizing the wireless telecommunication device with the reference radio signal; 
 generating, in the reference frequency generator supplying a frequency reference for the wireless telecommunication device, a first frequency and a second frequency simultaneously, the first frequency having a first response to the temperature of the reference frequency generator and the second frequency having a second response to the temperature of the reference frequency generator, the second response being different from the first response; 
 generating a temperature parameter characterizing the temperature of the reference frequency generator by using the first frequency and the second frequency; 
 generating, in the calibration procedure, calibration information for calibrating the wireless telecommunication device, the calibration information comprising the determined control parameter and the temperature parameter associated with the control parameter; and 
 applying a control parameter associated with a current temperature parameter to the reference frequency generator after the calibration procedure. 
 
   
   
     8. The method of  claim 7 , wherein generating the calibration information comprises:
 determining a calibration curve on the basis of the control parameter and the temperature parameter; and 
 storing the calibration curve. 
 
   
   
     9. The method of  claim 8 , wherein storing the calibration information comprises storing calibration points of the calibration curve into an associative data structure. 
   
   
     10. The method of  claim 8 , wherein generating the calibration information comprises:
 determining calibration parameters characterizing the calibration curve; and 
 storing the calibration parameters. 
 
   
   
     11. The method of  claim 7 , further comprising:
 generating a temperature-compensated control parameter on the basis of the calibration information as a response to an input of a temperature parameter; and 
 adjusting the frequency reference on the basis of the temperature-compensated control parameter. 
 
   
   
     12. A computer readable medium encoded with a computer program, the computer program encoding instructions for executing a computer process in a digital processor in a wireless telecommunication device, the computer process comprising:
 determining, in a calibration procedure, a control parameter controlling a reference frequency generated by a reference frequency generator by frequency synchronizing the wireless telecommunication device with a received reference radio signal; 
 generating a first frequency and a second frequency simultaneously, the first frequency having a first response to the temperature of the reference frequency generator and the second frequency having a second response to the temperature of the reference frequency generator, the second response being different from the first response; 
 generating a temperature parameter characterizing the temperature of the reference frequency generator by using the first frequency and the second frequency; 
 generating, in the calibration procedure, calibration information for calibrating the wireless telecommunication device, the calibration information comprising the determined control parameter and the temperature parameter associated with the control parameter; and 
 applying a control parameter associated with a current temperature parameter to the reference frequency generator after the calibration procedure.